# coding: utf-8

# 爬虫总调度

# 爬虫架构
# 主程序 程序入口 spider_main.py 入口参数url
# url调度        url_manager.py 负责url的存储与提供
# 页面解析        html_parser.py 解析页面 提取url title 简介
# 页面下载        html_downloader.py 根据url下载页面
# 页面输出        html_outputer.py 输出数据

import html_downloader
import html_outputer
import html_parser
import url_manager


class SpiderMain(object):
    def __init__(self):
        self.urls = url_manager.UrlManager()
        self.downloader = html_downloader.HtmlDownLoader()
        self.parser = html_parser.HtmlParser()
        self.outputer = html_outputer.HtmlOutputer()

    def craw(self, root_url):
        count = 1
        self.urls.add_new_url(root_url)
        while self.urls.has_new_url():
            try:
                new_url = self.urls.get_new_url()
                print 'craw %d : %s' % (count, new_url)
                html_cont = self.downloader.download(new_url)
                new_urls, new_data = self.parser.parse(new_url, html_cont)
                self.urls.add_new_urls(new_urls)   #曾经少了一个s
                self.outputer.collect_data(new_data)

                if count == 50:
                    break

                count +=1
            except Exception as e:
                print 'craw fail : %s' % e

        self.outputer.output_html()

if __name__ == '__main__':
    root_url = 'http://baike.baidu.com/view/21087.htm'
    # root_url = 'http://baike.sogou.com/v58828.htm?fromTitle=Python'
    obj_spider = SpiderMain()  #创建爬虫
    obj_spider.craw(root_url)  #启动爬虫

